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Yep, it's an actual GPS. It's a Garmin Oregon 650 designed for outdoors stuff. I did pull the GPS tracks into Google Earth last night, and there Google calculated something like 13.5 miles compared to the Garmin calculation on the GPS unit itself of 16.0. My best guess is Garmin measured every distance between every point while Google smoothed them a bit. Two and a half miles of small, extra segments seems huge, but it's the only theory I have.